sftpman: add module

tests/modules/programs/sftpman/example-settings.nix

@@ -0,0 +1,44 @@
+{
+  config = {
+    programs.sftpman = {
+      enable = true;
+      defaultSshKey = "/home/user/.ssh/id_ed25519";
+
+      mounts = {
+        mount1 = {
+          host = "host1.example.com";
+          mountPoint = "/path/to/somewhere";
+          user = "root";
+          mountOptions = [ "idmap=user" ];
+        };
+        mount2 = {
+          host = "host2.example.com";
+          mountPoint = "/another/path";
+          user = "someuser";
+          authType = "password";
+          sshKey = null;
+        };
+        mount3 = {
+          host = "host3.example.com";
+          mountPoint = "/yet/another/path";
+          user = "user";
+          sshKey = "/home/user/.ssh/id_rsa";
+        };
+      };
+    };
+
+    test.stubs.sftpman = { };
+
+    nmt.script = ''
+      assertFileContent \
+        home-files/.config/sftpman/mounts/mount1.json \
+        ${./expected-mount1.json}
+      assertFileContent \
+        home-files/.config/sftpman/mounts/mount2.json \
+        ${./expected-mount2.json}
+      assertFileContent \
+        home-files/.config/sftpman/mounts/mount3.json \
+        ${./expected-mount3.json}
+    '';
+  };
+}